Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcb86e510f3e856…

MALICIOUS

PDF

47.4 KB Created: 2020-08-29 10:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dbb38eb61027fc03cbed36c4e2bd21b SHA-1: cfd77e8670b61f0c66fee4c49d8db22351ad9b4d SHA-256: 9dcb86e510f3e8569cab3e5801963e9b649c7108ea2c3d8bc74ad0896b4d3c13
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of the malicious URL and the link farm heuristic suggest a phishing or malware distribution attempt. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=teoria+da+literatura+2
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/animorphs_book_54.pdf
    • https://cdn.shopify.com/s/files/1/0431/9664/5538/files/22645969453.pdf
    • https://cdn.shopify.com/s/files/1/0434/6049/3465/files/idsa_mrsa_guidelines_2016.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/751596699.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/461677233.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6749ae73bce4fd8b2c312012ea23b8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_59faa54f4929421b8ef1af17bd4c860f.pdf
    • https://static.usrfiles.com/ugd/b8c837_836129c2b9ef4e7ebe5430cd1340afb1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f51ac665798844559ba0fad75a12b8c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_60c32697e40e47429aa316643a28fa53.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/82548648136.pdf
    • https://cdn.shopify.com/s/files/1/0433/3463/1579/files/5542740831.pdf
    • https://cdn.shopify.com/s/files/1/0437/3626/8949/files/valoracion_apgar.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/78829289986.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fba20c10aed4626bec197012fb0036f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7445b1e66c644936a3e938e07210db53.pdf
    • https://static.usrfiles.com/ugd/b8c837_458f9cdea1df479fa91c22d9be8b8c9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e80f3863e9394ff49499568e03ae0785.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ff3a7138cc3429ea17e92826c9049c5.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078b4.bin
9b6d6ef030c1997cf1e73cd53492de8a074a7a7407e18e228550b275a687641e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B4 4720 bytes
font_01_sfnt_off000088c4.bin
64e35463d4b24dddcab932197ab28f589f3ee236602d0e0a937fad68fcc1f071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88C4 12584 bytes

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